initial commit

dialer/ws/dialer.go

@@ -0,0 +1,132 @@
+package ws
+
+import (
+	"context"
+	"net"
+	"net/url"
+	"time"
+
+	"github.com/go-gost/gost/v3/pkg/dialer"
+	md "github.com/go-gost/gost/v3/pkg/metadata"
+	"github.com/go-gost/gost/v3/pkg/registry"
+	ws_util "github.com/go-gost/x/internal/util/ws"
+	"github.com/gorilla/websocket"
+)
+
+func init() {
+	registry.DialerRegistry().Register("ws", NewDialer)
+	registry.DialerRegistry().Register("wss", NewTLSDialer)
+}
+
+type wsDialer struct {
+	tlsEnabled bool
+	md         metadata
+	options    dialer.Options
+}
+
+func NewDialer(opts ...dialer.Option) dialer.Dialer {
+	options := dialer.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &wsDialer{
+		options: options,
+	}
+}
+
+func NewTLSDialer(opts ...dialer.Option) dialer.Dialer {
+	options := dialer.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &wsDialer{
+		tlsEnabled: true,
+		options:    options,
+	}
+}
+
+func (d *wsDialer) Init(md md.Metadata) (err error) {
+	return d.parseMetadata(md)
+}
+
+func (d *wsDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (net.Conn, error) {
+	var options dialer.DialOptions
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	conn, err := options.NetDialer.Dial(ctx, "tcp", addr)
+	if err != nil {
+		d.options.Logger.Error(err)
+	}
+	return conn, err
+}
+
+// Handshake implements dialer.Handshaker
+func (d *wsDialer) Handshake(ctx context.Context, conn net.Conn, options ...dialer.HandshakeOption) (net.Conn, error) {
+	opts := &dialer.HandshakeOptions{}
+	for _, option := range options {
+		option(opts)
+	}
+
+	if d.md.handshakeTimeout > 0 {
+		conn.SetReadDeadline(time.Now().Add(d.md.handshakeTimeout))
+		defer conn.SetReadDeadline(time.Time{})
+	}
+
+	host := d.md.host
+	if host == "" {
+		host = opts.Addr
+	}
+
+	dialer := websocket.Dialer{
+		HandshakeTimeout:  d.md.handshakeTimeout,
+		ReadBufferSize:    d.md.readBufferSize,
+		WriteBufferSize:   d.md.writeBufferSize,
+		EnableCompression: d.md.enableCompression,
+		NetDial: func(net, addr string) (net.Conn, error) {
+			return conn, nil
+		},
+	}
+
+	url := url.URL{Scheme: "ws", Host: host, Path: d.md.path}
+	if d.tlsEnabled {
+		url.Scheme = "wss"
+		dialer.TLSClientConfig = d.options.TLSConfig
+	}
+
+	c, resp, err := dialer.DialContext(ctx, url.String(), d.md.header)
+	if err != nil {
+		return nil, err
+	}
+	resp.Body.Close()
+
+	cc := ws_util.Conn(c)
+
+	if d.md.keepAlive > 0 {
+		c.SetReadDeadline(time.Now().Add(d.md.keepAlive * 2))
+		c.SetPongHandler(func(string) error {
+			c.SetReadDeadline(time.Now().Add(d.md.keepAlive * 2))
+			d.options.Logger.Infof("pong: set read deadline: %v", d.md.keepAlive*2)
+			return nil
+		})
+		go d.keepAlive(cc)
+	}
+
+	return cc, nil
+}
+
+func (d *wsDialer) keepAlive(conn ws_util.WebsocketConn) {
+	ticker := time.NewTicker(d.md.keepAlive)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
+		if err := conn.WriteMessage(websocket.PingMessage, nil); err != nil {
+			return
+		}
+		d.options.Logger.Infof("send ping")
+	}
+}